Correct 18S data file to assign taxonomy

Question

[Bioinfo]

I want to perform taxonomy identification using assign taxonomy and silva 18 S data set but I got this error message:

Error in assignSpecies(seqs, refFasta = refFasta, allowMultiple = allowMultiple,  : 
  Incorrect reference file format for assignSpecies (this looks like a file formatted for assignTaxonomy).

I used this file: silva_132.18s.99_rep_set.dada2.fa

Can you please tell me what is the correct file for taxonomy identification of 18S data

Thank you